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Scilabヘルプ >> Elementary Functions > elementarymatrices > empty

empty

([]) 空行列

説明

[] は空行列を定義します. この行列は特殊な行列として定義され, 0行0列,すなわちsize([]) =[0,0]となります. 以下の便利な表記が使用可能です:

[] * A = A * [] = []

[] + A = A + [] = []

[ [], A] = [A, []] = A

明示的な答えがない場合,行列関数は [] またはエラーメッセージを 返します. 空の線形システム (syslin リスト) は複数の行または列を有する可能性があります.

例s

s=poly(0,'s'); A = [s, s+1];
A+[], A*[]
A=rand(2,2); AA=A([],1), size(AA)
svd([])
w=ssrand(2,2,2); wr=[]*w; size(wr), w1=ss2tf(wr), size(w1)

参照

  • null — deletes a list component or a field of a structure, Mlist, or Tlist
  • isempty — 変数が空の行列または空のリストかどうかを調べる
  • emptystr — 長さ0の文字列
  • brackets — Concatenation. Recipients of an assignment. Results of a function
  • operators — scilab 演算子の名前
  • matrices — Scilab オブジェクト, Scilabの行列

履歴

バージョン記述
6.0.0
  • A+[], []+A and A-[] now return [] instead of A. []-A now returns [] instead of -A.
  • A>[], A>=[], A<[], A<=[], []>A, []>=A, []<A, and []<=A now return [] instead of an error.
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